Internal combustion engine



FIG. 1 is a first perspective view of the internal combustion engine according to the novel design.

FIG. 2 is a second perspective view of the internal combustion engine of FIG. 1.

FIG. 3 is a third perspective view of the internal combustion engine of FIG. 1.

FIG. 4 is a side elevational view of the internal combustion engine of FIG. 1.

FIG. 5 is a top view of the internal combustion engine of FIG. 1.

FIG. 6 is a bottom view of the internal combustion engine of FIG. 1.

FIG. 7 is an end view of the internal combustion engine of FIG. 1 showing the end of the engine from which the device shaft protrudes; and,

FIG. 8 is an end view of the internal combustion engine of FIG. 1 showing the opposite end of the engine. 

The ornamental design for an internal combustion engine, as shown and described. 